16.The agriculturist, Wang Chen-ho creations of wood for insertion of success, he also invented the punner racks, with a simple machine, increasing the efficiency of the typesetting.
到了元代,农学家王祯创制木活字成功,他还发明了转轮排字架,用简单的机械,增加排字的效率。
17.This paper introduces the method of simple conversion measuring and calculation for gear rack thickness with depthometer as prime measuring tool and Measuring Pin,measuring ball as auxiliary tool.
介绍了以深度尺为量具,以棒、球为辅件的齿条齿厚简易转化测量与计算方法。
18.An intelligent clothes rack is developed with a block installed on the end of each knighthead,around which steel wire is enwind and connected to a DC motor and the clothes rail.